$\"\"$

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The function is $\"\"$ .

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Consider moving point is $\"\"$ .

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Consider $\"\"$ is the distance between the origin $\"\"$ and the point $\"\"$ .

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The distance between two points is $\"\"$ .

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Then $\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

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The power rule of the derivative : $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Rewrite the expression.

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$\"\"$

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Substitute $\"\"$ in above expression.

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$\"\"$

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$\"\"$ .

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$\"\"$

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The rate of change of distance is $\"\"$ .